Photographic and cinematographic film employed without use of a protective paper strip



Feb. 1935 Q ME 1,989,813

PHOTOGRAPHIC AND GINEMATOGRAPHIC FILM EMPLOYED WITHOUT USE OF A PROTECTIVE PAPER STRIP Filed Dec. 20, 1929 1 A v,,. 1 I |IrI ZII 11111111111111! Patented Feb. 5, 1935 PHOTOGRAPHI Q AND CINEMATOGRAPHIC FILM EMPLOYED WITHOUT USE OF A PBU- TECTIVE PAPER STRIP Hermann Lnmmerzheim, Dessau-Ziebigk in Anhalt, Germany, a's'signor to Agfa Ansco Corporation, Binghamton, N. Y., a corporation or New York Application December 20, 1929, Serial No. 415,577

In Germany December 22, 1928 .8Claims.

, The present invention relates to coils of photographic and cinematographic film and more particularly to those in which no protective paper strip is provided to protect the light-sensible 5 emulsion against the action of light.

According to my invention, rolls of photographic and cinematographic films without any protective paper strips are prepared in a simple manner by applying on the film band on both ends over the surface of the rear side of the film a dye preparation which penetrates deeply the interior parts of the support, which dries in a very short time and which after drying is impermeable to the actinlc rays of light and insoluble in the usual photographic developing baths.

The dye preparations which I use for this purpose consist of a solution of a dye in an organic solvent and preferably in an ether or ester of a polyvalent alcohol, such as for instance glycol or glycerin. When such a solution is used for printing on the reapside'of both ends of a film strip, the dye penetrates quickly and deeply into the support layer and therefore is especially stable to the action of the usual photographic developing liquors.

The selection of the color depends upon the degree of sensitiveness of the light-sensitive layer used in each particular case. It is not necessary) of photographic roll-films.

'that the dye, when applied in a single layer, possesses the required impermeability to light, for it will sufiice that it keeps OK the actinic rays when applied in several layers. the actinic light-rays are well known in the art and those which are to be chosen in a special case may easily be found by a simple experiment.

The following examples illustrate some dye preparations that I use for my purpose.

Example 1.--A saturated solution of cerasin-red (Schultz, Farbstofftabellen, VII ed., page 217, No. 532) in glycol acetate is prepared and printed on the rear-side of both ends of a photographic film strip having a support of nitrocellulose insuch a length that the film to be protected against the action of light, when coiled on a spool, is covered by two or three layers of its imprinted parts.

To enhance the fastness of the coloration, I may add a colloid to the dye preparation which is soluble in the solvent for the dye and which has no ill effect upon the photographic emulsion. I

prefer to use for this purpose cellulose deriva- Dyes absorbing tives, as for instance acetyl cellulose or an amino derivative of cellulose.

strength of acetyl cellulose in glycol acetate and the mixture is used to provide protective coloration on the rear-side of a photographic film support in the manner described in Example 1.

When adding a colloid to the dye preparation I need not employ a soluble dye. In this case the subsequent treatment of the film. For this purpose, too, cellulose derivatives may be used, I

for instance a solution of benzyl cellulose of 1 per cent strength dissolved in amixture of acetone and benzene.

A film cartridge manufactured in this manner, may be exchanged at day-light without danger of exposing the sensitive layer to light. The process of imprinting the both ends of the film strip can easily be performed in the usual manufacturing The film support at the moment of printing is very easily penetrated by the dye, the drying occurs in a very short time, so that the preparation of films inthe manner described can be carried out in the course of manufacturing the films without difficulties.

It is obvious that the present invention is not limited to the examples or to the details given therein. Thus, for instance, as mentioned above, other dyes may be used to prepare the light-absorbing coloration of the film ends. Instead of glycol acetate mentioned in the examples, I may use. other derivatives of polyvalent alcohols, as

for instance hydroxy-prophyloxy-ethane or another ester. or ether of glycol or glycerin.

In the accompanying drawing Fig. 1 represents a view and Fig. 2 a section of the leading end of a photographic film prepared according to the present invention. The support 1 consisting of a cellulose derivative shows an area 2 which has been dyed in the way described above. On'its whole surface the support is coated with a light sensitive emulsion layer 3.

-What I claim is: v

1. In the process of manuiacturing coils of photographic and cinematographic film for daylight loading. cartridges, the steps which comprise mixin; an actlnic light-absorbing dye which is insoluble in water and the photographic developing baths, with a derivative of a polyvalent alcohol selected from the group consisting of ethers and esters of polyvalent alcohols and applying the said dye solution to both ends of the film strips 1 upon the surface of the rear side of the film in alength equal at least to one circumference of the coiled spool.

2. In the process of manufacturing coils of photographic and cinematographic film for daylight loading cartridges, the steps which comprise mixing an actinic light-absorbing dye which the said dye solution to both ends of the in a length corresponding at least once with the circum ference of the coiled spool.

4. In the process of manufacturing coils of photographic and cinematographic film for daylight loading cartridges, the steps which comprise mixing cerasin-red with a solution comprising glycol acetate and cellulose acetate and applying the said dye solution to both ends 01 the film strips upon the surtace'of the rear side of the film in a length corresponding at least once with the circumference of the coiled spool.

5. In the process of manufacturing coils of photographic and cinematographic fllm for daylight loading cartridges, the steps which comprise mixing soot with a solution comprising glycol ace- .tate'and cellulose acetate and applying the said dye solution to both ends 01' the film strips upon the surface of the rear side of the film in a length corresponding at least once with the circumference of the coiled spool.

6. In a daylight loading cartridge a roll film strip without protective paper strip and dyed on both ends on the rear side in a length corresponding at least once with the circumference of the coiled spool with a dye selected from the group consisting of cerasin-red and soot.

l. In a daylight loading cartridge a. roll film strip without protective paper strip and dyed at both ends on the rear side in a length corresponding at least once with the'circumierence of the coiled spool with cerasin-red, said cerasin red having deeply penetrated the support.

8. In a daylight loading cartridge a roll film strip without protective paper strip and dyed at both ends on the rear'side in a length corresponding at least once with the circumference of the coiled spool with soot, said soot having deeply penetrated the support.

HERMANN LUMMERZHEIM. 

